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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efea3bbc854458bee6bf0580b1e82bbb9d2eb3e2d64edb2dda22ddf8086c8d5d' 
  AND token = 'wsK8m0H7ZZnxlTkcCweZIX1OeZHSjcld9/5Zx15q12Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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