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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97f8abf23a16e3d3d0bf23d7e5afb17c7f8030b83f8f963458cf430d7518f3ed' 
  AND token = 'B3u+AHuBI5hRnba1ZGaCAYIGhmfJHkkD5ouNQCkHNhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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