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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bb2c92d3127ec642612a31b203337e4ff26c4da774ad68e446dea13324fe09e' 
  AND token = 'JvIABmaYi5kvIboTthlbwa/ElsUqwm7UhAStK1Zx1Ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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