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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab7c3859f5fc75bb89bc2fc599b0a250f05565eb6f8bd7c11a50dad5a10d2663' 
  AND token = '5ojfQmY4+cqJ9xRqGIjgomKUtgqoxGtVvNNF+DlD32c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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