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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c19f3414f5afc0567e9f379193723df06f17d7dd816b75c58ea86a934d873f5' 
  AND token = 'aF4RVGVffwQEQATZJAdjA69TPrPyQVQrTwVhMQlrXrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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