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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0071870e3eed3ba77833ae3d71c111dce07c76f626c1ac9859e5e83c4bc01b0' 
  AND token = '29zclyrrKdrF+peeUeBuKijLcDov0aRcd3aUm0IyA30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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