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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dbf653228388c4cc97158543d2c2ac9d8fc1ad2c9d2202950d9665fa12d4b8c' 
  AND token = 's/LX/5dXhW1pRzwq1S3/qgeQeHMSn/D/2CJMueU3aNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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