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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ad6da8a8d1e4b464b272a22d40c7970f98ee3faeb95f93c3c6e4fb230fd6907' 
  AND token = 'Z1NCyyT/+MvCMT+CbxW0COlSx7Qnz/FJiDOJC7xZc3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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