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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba284ea9372f3cfc5921e64aa35f7cab96f04b192419f5b01c5146039b6ac319' 
  AND token = 'GVwqqutxdBWn0PZIm+sDkmgW4DNeZf0c/gFMUgdQk10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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