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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17d4513d9858859d908768fd7bdc5c24b8b5114e9a6528cd42d0ee14feacd0ab' 
  AND token = 'AJYS/sf4c31ZjPejq1MjqE6yxp9/rCGUE1l1x01Jrh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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