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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '611ffb587c84d95ab46a61eb353c006068c2c0eb431a9005a8d7a3da14e91455' 
  AND token = 'ZSc10vjypKGVRzH8Yh/kgOf446HeDXM257Q2gbHKxIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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