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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e681c7862b20572eae591ae08bcfc9d5d742f58c1210b07a3816aafc06890423' 
  AND token = '5ybapHgd48Y4NQHL925/C8ZzZLY5e0NAqyhlFZKwxSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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