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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f0cbfbe9bb31a1dabe9dc47c166e12b6595a0baf3215e13b6e5f46ef99523a0' 
  AND token = 'WXjfSinWQfTvk229sJsWH0EnQNpLdzJMUaQ1JhamK20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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