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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08aa8767e5a08ffcd1883793be215a0263d88fb09623521cbdb0d14d9626011d' 
  AND token = 's6Oro7Beub3/kz3i3Uhi8pcD4Kv19CVuJZANQZJNVC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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