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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cd85d2c9043d5331e9290dc5d4b7efd092ef11c70be224223f43d1eec8c3939' 
  AND token = 'f8BJwppsQXUY1qlo344EWlzSfKDZdSNOain6m4sCBis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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