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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c780f41e2b255409427d7f1d963e8626c32d371f68a9c54af1ec866c2ce859de' 
  AND token = 'lB8j37lT8wEa6Z2BLo33BWgi6Afl6Ku38AuE0zQJAyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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