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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52b85ee98cb955958b31147c83520762f83b8234416087dbcfe28bd6ad34d7a5' 
  AND token = 'n5Koaq3EV1FXZICCqNOCUjT90Aj71n26SQKAq+p99as=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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