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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4ff5f1c2ef8c78d06ccf2a26c5353647f783b7406bdfadfc7739afcbdf41fe7' 
  AND token = 'OQUFG7kH6v6Bg691lVbwnk1Uf3nUQTcjqsk4ZKtusAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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