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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3990817be928aadcd7a1d8be88dde378f546853e97ab5bc6fc563d9b4665d6a' 
  AND token = 'rACBHvZUtfL98Rdss3/khpOG6ZoE+APTNU5mLGtamqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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