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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5127e08abac543409bff93899ac1d2c3d4b47fe90c11083768d9245794f9684' 
  AND token = 'eZUdYoyDuGD1ATDV5nu2mpcgkPlRy12Z9+na+I1WimM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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