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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd57b7538b1ee05c03387acbd3a824b83771a41bb49792eeb0b95b76d48ba6b31' 
  AND token = 'JozIh/6oc8hkwb6aiDhIWl1ywSkGTszi7twf7n8pCVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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