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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '687f85946e41d979ca1d858d29fe1ea272bd077148137d9d6b8e05419c9a3118' 
  AND token = '7Nu6+hDHnuccZnuQL7421z8zSUWRKX9hBWZtqSWiNjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}