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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a170a41b957764ea8cd202936bbe8b759a5edb6565caa64aa3d4f72830ed59d' 
  AND token = 'yW7a18zB5LuGKOizSX83ZVIY8yEdcPzDHqW5UvNFjvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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