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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '699a0355ff9b4ca6e9c5768187026ae5092dbc4af07107347b182034bc3d971b' 
  AND token = 'WFzfm0zofTl6sBO5xmAXRMW49WwSgtZJNAzrp7+6RJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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