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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01e62e99200bc69c8af09d6b9f3e093714b9c0b3a86fc10a9f1698f60b3a895e' 
  AND token = 'jc/os2M4QV9SlcigYMVvncC/wKC5LJCV/7vqqj7z9d8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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