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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1446f5bd437a5bdccc29f01c135345cb0ba25b1915d35b56abf86e7fbb160758' 
  AND token = 'pCc8J4Mst2BSaAAYKPEWryozgzXZFm4pRUSsGcpIhiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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