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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b87baa4c5216c8768c212db347ffd330372408f7ace7238927aa76f76e2c5552' 
  AND token = 'V6lERX/JC5nZGQcNB0oJW/r33YD+PaSEPlsUH7PGqkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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