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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b5e902aec92035ebd2f314f683409aa4dc7727b54588212964c9d8f0b41b7d1' 
  AND token = 'oztuFfZGy3sqEE6Xg8by6+Iq4cbBooBo7pUa3Ce5qfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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