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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20dd1fd9680343d34477026d18c70e904990810d829a675f0815743e61195cfd' 
  AND token = 'p9MXI2+4wDaeBWS8OVm5zQVh4Urd0A1ZalBf7TLYQ2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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