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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dc64c95f398f275186885c15f84ffeb69bf6336c9f23b717856622c0d2dae43' 
  AND token = 'FFUZMGztW6zufQUxD5Iyy6dXFYfyzWlm6J6RouBTSWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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