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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83afc6157d23188f6e1fd5c03267c06b6b12bd246dc4a0ab4af0c32cfc8a1509' 
  AND token = 'z0JNajB21AOxpHEDhZvky85QG5UcMs/p/34WZJEXJjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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