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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34084825328562e4950201ec29fb84f684310b772fa81f5a9757e0ab4b6016c1' 
  AND token = 'BquUjnYYFJKr+j0ZM+23c+UEdyyCtAn4P2qOL7KI01g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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