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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fb0b4445e0fe45f44fd502fd17cd8d6788542006e1c80c15cc1bc99f51989f9' 
  AND token = 'VoZY43NnCXgauuSGAZ0ziCSMjRiYpe/HUlLPbKL7bEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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