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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3de65eaa245b6e190d2bf087a05d13fd5baeaa9f319139170e6b43e211363c2' 
  AND token = 'LtZTSJpaKPI7t5dtQIJZDK1X+0JEfwdlyBpaWu82R44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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