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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dceba816f4c5357f22cc117d9e90d85b04f52b5d8d7c38cb55717badbacc4e6' 
  AND token = '88lSyA19zNIypGcC0ik2oUYgJMNcLoqvhYc53yAerF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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