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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f8a7a7d60d851d5477d0247dd78a5b996c6d41cc8ee57267f0d19be9ec3e9a6' 
  AND token = '6+zxTHrECgwm0a6fpuBxt/Bb10QDu2WQG2jWii/m1yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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