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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad40e2938ef55d022ea249f7b98b26cea514c5e8b20c904b8f5a7bfd045b5ee7' 
  AND token = 'uFpQ7Hl5Y6cTd2RDINlJfMfSYV5JOJL9kSaBI/eoHMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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