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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc2d9372abd635c4f73f38c56b2464503c1be9481b46e3c66f92cf49b2343e18' 
  AND token = 'IU0jahiPNbIDPVSuJQyEBoCailYLYh4Ee0iQEti5KvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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