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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3441ed3e36d1aebdfb98dc8ce84198caa251f43a097a96d571affb32e3dbc91' 
  AND token = '4WJvBZzMMfHaCWKDTgShIpTrDpWZ19BI4Jk5C6TXSvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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