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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '682bce1bb8427192289b48f08118c2c5c0e4b57b5b42b30ec8d7474e75ca3601' 
  AND token = 'V2uKEpSweilZr6eSrwX6jvZv/vnW8kLnxBTgjm/rGSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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