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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '304c3340a2c4db3ebfec76d6653794d3a9054f985622c3c8eb9e718cfb04ff68' 
  AND token = 'yTd0wAhbUcCSwjIpO1qZ0jLtu2r9THpS7dhcr7HgCbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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