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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4d0e8872fde81b41ad18dbd120ee78b4f4cbc9c1b3c34ad54a09a70615a17fa' 
  AND token = 'hNYITI8D0ZsXcr8xLDjhhkY+JsHiZzgBf1FhucRDN40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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