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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b9af0aa768caf73f9f9f73fa653cbf3ca5a2419c82ef3e99bff98cb06d92b73' 
  AND token = 'Ke1nTCzPHAS7ASkPd5apxH+BLKt7FCTP769LeciqUdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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