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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d1f1abb6f06dc07946b783d83e286d05f58d64dd720610b3903f8fddd4135c2' 
  AND token = '7eG3T/3a6xOAR9jmqVgo2EuNrbvl1h85pZdx2gRQvKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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