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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ce4a2762479ed59edd9774e0a21f3a98bb64af3f1dd7e2a61b8baf14f41948b' 
  AND token = 'oDKIFH8QOm3o3ia8U8Z1XeusDyd/jqIKOd2fWWG/M0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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