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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dec5b816708c7348cafae913bc608c6cb70e6934d1ea60d861f43b4443734783' 
  AND token = '5Gqpuz5UZwW306x7D+bEgxPhgdeQIw9rpw0huFeYOC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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