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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb5b03980782fc1aaa0cfc787c3ed77a3c07eb3d8bdd9093fd96ff7da9e889ac' 
  AND token = 'ohRyhEgfSABjN2jCWob4eeU1t6F8f/Xu9+Qsg3CIVxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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