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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '778cfdca68eaac76b5fc3eece05c0a9f1b45623a66fb5f09c20fdb0ad32d98f4' 
  AND token = 'UKAVf2MTLSTagGsV79nEv95e8GTepu6o275yXMI6kC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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