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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b70bdc62ffb0946bbf48e03a8e595efff617294ab04ac0672cc315fe53ed278' 
  AND token = 'wu4egg8Pil4YXoUO03oFSTEtpyL3WkA5IdyY5xwYN4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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