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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82bd34b7d4f28b53d3d55fabd903ce6a2ed5ea03838704077df48e839befb274' 
  AND token = 'McjlqZZtoCF1UXBnn9jKmRnQhWkfU5PP8aZ1CdXngDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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