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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2af4bef2acf1b35a4bc903717644c38f93a1b99a77341da3ffdc80fb0c9305e7' 
  AND token = 'M4qvGgpB6Xo/jFD6IvP/iInTQDyd1UaOCtaUtEvXW1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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