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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18ae45a577082c51b7a1d9deed2ec634a82eb260ce8a3547f0d8756a0639ab89' 
  AND token = 'XUVr0O/lvjzPJ30JZYP4bMjje14W9M5xkHls2wlCthE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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