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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d77ed2800651864d69cab9da07fd7c85aedb01e526dd842d622843221e2c460' 
  AND token = 'cyqdSDvNbkrfWY9YlZxiz/KnE+d7ugJedZgbDg4JPlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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