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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b0c34253df71f1e2fe65bdd4718d0ef8e607ba358c6e64460c7c1a27aceceef' 
  AND token = 'znN89Au25OvLgzmTDBVsxOf9c2Pl2PGmS+V8DlJ2qjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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