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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '101f44923ca11fe58327fb0f63a9d5e0986855aca3c1fa487ea8a941abded471' 
  AND token = 'zgrVxXutdjyPNQtx0ET1PcM8BGhZpy2+eE5Jxm4Z2SE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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