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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b494da10fca7aab0b4371a9822a1b221b1b87b9782aece0ae4227dbdf4945c78' 
  AND token = '77VGJllDmB0ms9hoT3qpWs0aGBQTpgArIudJX1MC/ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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