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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd0883ae3254b7dbdd4a166769c68786f12b318d4025f4b618462c20a33fda9a' 
  AND token = '7rMNVvGSef28+y/DAFwLKL+mXsW0Q6kIvewSaS6Bl0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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